Item 8.01 Other Events.

On November 16, 2021, Interstate Power and Light Company ("IPL"), a subsidiary of Alliant Energy Corporation, entered into an Underwriting Agreement (the "Underwriting Agreement") with Goldman Sachs & Co. LLC, J.P. Morgan Securities LLC, MUFG Securities Americas Inc. and U.S. Bancorp Investments, Inc., as representatives of the several underwriters listed therein (the "Underwriters"), pursuant to which IPL agreed to sell, and the Underwriters agreed to purchase, subject to the terms and conditions set forth therein, $300 million aggregate principal amount of IPL's 3.100% Senior Debentures due 2051 (the "Debentures"), in a public offering (the "Offering"). The Debentures are to be issued under an Indenture dated as of August 20, 2003, between IPL and The Bank of New York Mellon Trust Company, N.A., as successor trustee (the "Indenture"), pursuant to an Officer's Certificate provided pursuant to the Indenture setting forth the terms of the Debentures (the "Certificate"). The Offering is expected to close, subject to standard closing conditions, on November 19, 2021.

The Debentures are registered under the Securities Act of 1933, as amended, pursuant to an automatic shelf registration statement on Form S-3 (Registration No. 333-251353-01) that IPL filed with the Securities and Exchange Commission (the "SEC") on December 15, 2020 (the "Registration Statement"). The Registration Statement was supplemented by a Prospectus Supplement setting forth the terms of the Debentures that IPL filed with the SEC on November 17, 2021.

This Current Report on Form 8-K is being filed for the purpose of filing exhibits to the Registration Statement relating to the public offering of the Debentures, and all such exhibits are hereby incorporated into the Registration Statement by reference. The Underwriting Agreement is filed as Exhibit 1.1 and the Certificate is filed as Exhibit 4.1 to this Form 8-K.

On November 16, 2021, IPL issued a press release announcing that it had priced the Offering. The press release is filed as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Perkins Coie LLP, counsel to IPL, has issued an opinion to IPL, dated November 19, 2021, regarding the legality of the Debentures upon issuance thereof, and Simmons Perrine Moyer Bergman PLC, Iowa counsel to IPL, has issued an opinion to IPL, dated November 19, 2021, regarding certain legal matters relating to Iowa law. The opinions are filed as Exhibit 5.1 and Exhibit 5.2 hereto.

Item 9.01 Financial Statements and Exhibits.



(d)Exhibits
Exhibit No.         Description
1.1                   Underwriting Agreement, dated November 16, 2021, among Interstate Power and
                    Light Company and the underwriters named therein.
4.1                   Officer's Certificate creating the 3.100% Senior Debentures due 2051 of
                    Interstate Power and Light Company.
5.1                   Opinion of Perkins Coie LLP, dated November 19, 2021, with respect to the
                    3.100% Senior Debentures due 2051 of Interstate Power and Light Company.
5.2                   Opinion of Simmons Perrine Moyer Bergman PLC, dated November 19, 2021, with
                    respect to the 3.100% Senior Debentures due 2051 of Interstate Power and Light
                    Company.
23.1                  Consent of Perkins Coie LLP (contained in Exhibit 5.1 hereto).
23.2                  Consent of Simmons Perrine Moyer Bergman PLC (contained in Exhibit 5.2
                    hereto).
99.1                  Press Release of Interstate Power and Light Company, dated November 16,
                    2021.
104                 Cover Page Interactive Data File (embedded within the Inline XBRL document)

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